Template for users to create a form page

System

Hi - I am working on a template that will allow users to create an html form. One of the requirements is for users to specify, for example, which checkboxes are checked by default. The syntax in html for that is <input type="checkbox" name="mycheckbox" CHECKED>. However, within xml, attributes without values (i.e. CHECKED) are not supported.

I have looked extensively on the web for an alternative - I have tried checked="true", checked="1" - I have even tried putting checked inside CDATA to make the parser accept it, but I haven't had any luck.

Has anyone tried this before or does anyone have other ideas? I am trying to do the same thing with dropdown boxes and radio buttons, but I'm running into the same issues.

Thanks in advance!